Hello,
i got this error during editing, i don't know if it' linked to array and global variable but i was working on it during this bug, so it may be related.
so to explain when it happened:
i was doing my states using 19 global variables Objects (UI textures)
Finally after more works i decided to replace this 19 variables to 1 array contining them.
and so after editing this array i had to replace all my old actions using old Global Variables by this Get array, store value and replace by the simple variable containing the Object.
and i deleted the old Globals after the works was done.
and i seen that my array was not the right one, so i modified this in the action, and the bug appears at this point.